1. Turn on the ignition.
2. Press the "EC" button on the climate control unit. The light should turn off, indicating that the EC (Economics) mode is disabled.
3. Adjust the temperature and fan settings as desired. The AC should now be functioning normally.
Note: If the EC light does not turn off when you press the button, there may be an issue with the climate control system. In this case, it's best to have the vehicle diagnosed by a qualified mechanic.